Tyre pressure for competition racing

The table below gives you some guidance for tyre pressure in competition. These values are not approved for use on the road. Please readjust to original settings when you leave the circuit

Pressures indicated are for informative purposes only, experienced drivers are free to modify them according to preferences and mechanic limits. Pressure should be adjusted in increments of 0.15 psi for more precision

In order to prevent irregular wear on DOT certified tyres, you are strongly advised against under-inflating your tyres. Under-inflated tyres lead to the appearance of circle shaped wear on the shoulder block.Correct inflation keeps risks to a minimum.

Driver's behaviour is key to ensure tyres wear evenly.

Vehicle type

Position

Pressure

Front wheel

Front

34.8/ 45psi

Rear

2.1 / 34.8 psi

Front engine/ Rear wheel drive

Front

34.8 / 45psi

Rear

30/40psi

Rear enginer/ Rear wheel drive

Front

34/45 psi

Rear

34/ 40 psi

How to reduce under or over steering

The table below describes customized geometry settings adapted for competition racing. Those values are not adapted for driving outside the circuit. Please turn the settings back tho their original values when leaving the racing venue

Adjustements

Reduce under-steer

Reduce over-steer

Pressure front tyre

Lower

Higher

Pressure rear tyre

Bigger

Smaller

Width front tyre

Larger

Smaller

Width rear tyre

Smaller

Larger

Camber front wheek

More positive

More negative

Camber rear wheel

More negative

More positive

Toe in front wheel

More toe-out

More toe-in

Toe in rear wheel

More toe-in

More toe out

Castor front wheel

Softer

Harder

Caster rear wheel

Harder

Softer

Front anti-sway bar

Soften ( thinner)

Stiffen

Rear anti-sway bar

Stiffen

Soften

Driving in the rain

In case of rain, you are advised to overinflate your tyres by approximatively 5.8psi in order to limit the risks of aquaplaning.

Quick reminder, aquaplaning occurs when a layer of water gathers between the contact patch and the road. It can leas to a loss of traction.

Increasing pressure rounds the profile of the tyre, reducing the amount of deflection.

As a consequence, the contact patch gets thinner and narrower so that it keeps the grooves in the tread open to channel off water.

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